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my $file_count = @ARGV;
foreach my $key1 ( keys %seen ) {
    if ( @{ $seen{$key1} } >= $file_count) {
...
        print "\n\n";
    }
}

# At the top of the file
use constant { 
    Key => 0,
...
    Count => 2, # Remove this if you don't use the total count
    Files => 3  # Should be 2 if Count is not used.
};

# In the read loop
$seen{$key1}[Key] //= $key;
$seen{$key1}[Sum] += $value;
$seen{$key1}[Count]++;         # Total count for the number of times t
+his value exists
$seen{$key1}[Files]{$ARGV}++;  # Count in this file

use Data::Dumper;
while (<>)
{
  # Your code here
}
print Dumper(\%seen);

use YAML;
while (<>)
{
  # Your code here
}
print YAML::Dump(\%seen);